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BU90054GWZ датащи(PDF) 9 Page - Rohm

номер детали BU90054GWZ
подробное описание детали  Fast transient response
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производитель  ROHM [Rohm]
домашняя страница  http://www.rohm.com
Logo ROHM - Rohm

BU90054GWZ датащи(HTML) 9 Page - Rohm

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BU90054GWZ
TSZ02201-0F1F0AG00060-1-2
© 2014 ROHM Co., Ltd. All rights reserved.
8.Dec.2014 Rev.002
www.rohm.com
TSZ22111・15・001
PC Board layout
The suggested PCB layout for the BU90054GWZ are shown in Figure. The following guidelines should be used to ensure a
proper layout.
1) The input capacitor CIN should be connect as closely possible to VIN pin and GND pin.
2) From the output voltage to the FB pin line should be as separate as possible.
3) COUT and L should be connected as closely as possible. The connection of L to the LX pin should be as short as
possible.
Figure 19. PCB layout
External parts selection
Inductor selection
The inductance significantly depends on output ripple current. As shown by following equation, the ripple current decreases
as the inductor and/or switching frequency increase.
f: switching frequency
L: inductance
IL: inductor current ripple
As a minimum requirement, the DC current rating of the inductor should be equal to the maximum load current plus half of
the inductor current ripple as shown by the following equation.
CIN
L
COUT
LX
VIN
GND
EN
VOUT
FB
(VIN-VOUT)×VOUT
IL=
L×VIN×f
IL
ILPEAK=
2
IOUTMAX +


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